Umbrella stand



FIG. 1 is a top, front perspective view of an umbrella stand showing my new design;

FIG. 2 is a left side elevational view as seen when in use;

FIG. 3 is a right side elevational view as seen when in use;

FIG. 4 is a rear elevational view, the front being identical thereto; and,

FIG. 5 is a bottom, front perspective view thereof. 

The ornamental design for an umbrella stand, as shown and described. 